a = input().lower().split(' ')
b = {'zero':0, 'one':1, 'two':2, 'three':3, 'four':4, 'five':5, 'six':6,
'seven':7, 'eight':8, 'nine':9}
numesr = [101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997]

r = str('')
if a[0] == 'zero':
    print('Wrong input')
    exit()
for i in a:
    try:
        r = r + str(b[i])
    except:
        print('Wrong input')
        exit()
r = int(r)
t = int(1)
y = int()
print(r)
for o in numesr:
    if r - o > 0:
        t = r - o
        y = o
    else:

        if t == 0:
            print(o)
            exit()
        else:
            if r - y < o - r:

                print(y)
                exit()
            else:

                print(o)
                exit()




